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cdefs: update for C23 and POSIX24

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Also tweak a few placs where we can now use macros for C23 and POSIX24.

Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D47580
This commit is contained in:
Warner Losh 2024-11-14 16:52:56 -07:00
parent f95d9ec921
commit 75b635c774
1 changed files with 24 additions and 12 deletions
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36
share/man/man9/cdefs.9
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@ -303,7 +303,7 @@ to distinguish it from newer standards.
Support for this compilation environment is dependent on compilers supporting
this configuration.
Most of the old forms of C have been deprecated or removed in
ISO/IEC 9899:2024 (“ISO C23”).
.St -isoC-2024 .
Compilers make compiling in this mode increasingly difficult and support for it
may ultimately be removed from the tree.
.It St -ansiC
@ -333,11 +333,11 @@ since there are no new C17 only symbols or macros.
.Pp
This version of the standard did not introduce any new features, only made
minor, technical corrections.
.It ISO/IEC 9899:2024 (“ISO C23”)
.It St -isoC-2024
.Dv __STDC_VERSION__ = 202311L
Strict environment selected with
.Dv _C23_SOURCE
though this is not yet implemented.
though ISO C23 support is only partially implemented.
.El
.Pp
For more information on C standards, see
@ -356,25 +356,37 @@ However, system headers not defined by that standard may define extensions.
.It Dv _POSIX_C_SOURCE = 199506 Ta St -p1003.1c-95 including St -ansiC
.It Dv _POSIX_C_SOURCE = 200112 Ta St -p1003.1-2001 including St -isoC-99
.It Dv _POSIX_C_SOURCE = 200809 Ta St -p1003.1-2008 including St -isoC-99
.It Dv _POSIX_C_SOURCE = 202405 Ta in the future IEEE Std 1003.1-2024 (“POSIX.1”) including ISO/IEC 9899:2024 (“ISO C23”)
.It Dv _POSIX_C_SOURCE = 202405 Ta St -p1003.1-2024 including ISO/IEC 9899:2018 ("ISO C17"),
.It Dv _XOPEN_SOURCE = 500 Ta St -p1003.1c-95 and XPG extensions to St -susv2 including St -ansiC
.It Dv _XOPEN_SOURCE = 600 Ta St -p1003.1-2001 and XPG extensions to St -susv3 including St -isoC-99
.It Dv _XOPEN_SOURCE = 700 Ta St -p1003.1-2008 and XPG extensions to St -susv4 including St -isoC-99
.It Dv _XOPEN_SOURCE = 800 Ta in the future IEEE Std 1003.1-2024 (“POSIX.1”) and XPG extensions to Version 5 of the Single UNIX Specification (“SUSv5”) including ISO/IEC 9899:2024 (“ISO C23”)
.It Dv _XOPEN_SOURCE = 800 Ta St -p1003.1-2024 and XPG extensions to Version 5 of the Single UNIX Specification (“SUSv5”) including ISO/IEC 9899:2018 (“ISO C17”)
.It Dv _ANSI_SOURCE Ta St -ansiC
.It Dv _C99_SOURCE Ta St -isoC-99
.It Dv _C11_SOURCE Ta St -isoC-2011
.It Dv _C23_SOURCE Ta in the future ISO/IEC 9899:2024 (“ISO C23”)
.It Dv _C23_SOURCE Ta St -isoC-2024
.It Dv _BSD_SOURCE Ta Everything, including Fx extensions
.El
.Pp
Note:
.St -p1003.1-2024
and XPG extensions to Version 5 of the Single UNIX Specification ("SUSv5")
support is incomplete.
.Pp
When both POSIX and C environments are selected, the POSIX environment selects
which C environment is used.
However, when C11 dialect is selected with
.St -p1003.1-2008 ,
definitions for
.St -isoC-2011
are included.
are also included.
Likewise, when C23 dialog is selected with
.St -p1003.1-2008
or
.St -p1003.1-2024 ,
definitions for
.St -isoC-2023
are also included.
.Ss Header Visibility Macros
These macros are set by
.Nm
@ -393,13 +405,13 @@ by convention with 199009 for
and 199209
.St -p1003.1-90 .
.It Dv __ISO_C_VISIBLE Ta The C level that's visible.
Possible values include 1990, 1999, and 2011 for
Possible values include 1990, 1999, 2011, 2017 and 2023 for
.St -isoC-90 ,
.St -isoC-99
and
.St -isoC-2011
.St -isoC-99 ,
.St -isoC-2011 ,
ISO/IEC 9899:2018 ("ISO C17"), and
.St -isoC-2024 ,
respectively.
In the future, 2023 will be used for ISO C2023.
.It Dv __BSD_VISIBLE Ta 1 if the
.Fx
extensions are visible, 0 otherwise.